1411 Practice Problems Chapt 1 3

CHEM 1411 – General Chemistry I
Practice Problems, Chapters 1–3
Chapter 1 – Chemistry: The Study of Change
1.

Element, compound, homogeneous mixture (solution), or heterogeneous mixture:
a) orange juice

b) brass

c) 0.9% saline (NaCl) solution

d) garden soil

e) room air

f) methane gas

g) sodium metal

h) N2 gas

i) Cu(NO3)2 crystals

(freshly-squeezed)

2.

Define (some of these terms are found in Chapters 2 and 3):
a)
c)
e)
g)
i)
k)
m)
o)

3.

b)
d)
f)
h)
j)
l)
n)

compound physical change law of conservation of mass extensive properties accuracy stoichiometry
Avogadro's number

Convert
a)
b)
c)
d)
e)
f)
g)
h)

4.

element solution chemical change intensive properties precision isotopes the mole limiting reactant

5 feet 10 inches to meters
55 miles per hour to cm per second
5.0 quarts to liters
1.00 ft2 to cm2
32.06 amu to g
25 g of carbon to moles of carbon
1.00 g of gold to number of atoms of gold
25 °F to Kelvins

How many significant figures are in the following numbers?
a) 3.1416

b) 6.022 X 1023 atoms/mole

c) 0.000104 g

d) 6.0 g/mL

e) 1.00794 amu

f) 5000 mi

5.

Perform the following operations and give the correct number of significant figures in your answers.
a) (0.031 mole)(12.011 g/mole) =
b) 4.12 g + 60.1 g + 135 g =
c) (3.258 g) / (27.8 mL – 25.0 mL) =

6.

An irregularly-shaped metal object has a mass of 10.867 g. When the object was immersed in 50 mL of water in a graduated cylinder, the water level rose from 50.0 mL to 58.5 mL.
What is the density of the object?

Chapter 2 – Atom, Molecules, and Ions
7.

How many protons, neutrons, and electrons are in the following atoms or ions?
a) iron–56
b) the element with symbol W and 109 neutrons
c) the +3 ion with the symbol Ga and 39 neutrons

8.

Name the following compounds:
a) CuCl2

b) Fe(NO3)3

c) AlI3

e) NiSO3

f) BaCO3

g)

i) XeF4

j) H2SO4 (aq)

k) HNO3 (aq)

l) LiBr

m) ZnO

n) Au2S3

o)

N2O4

p) HCl (g)

q) LiCN

r) KOH

s)

Li3N

t) FeO

PCl3

d) Ca3(PO4)2
h) NaNO2

9.

Give the